Posted by zack on Tuesday, January 31, 2012 at 10:03pm.
a group of 9 people spent $78 to go to the movies.adult tickets cost$10 each and student tickets cost $8 each.How many adult tickets were purchased?

math  PsyDAG, Tuesday, January 31, 2012 at 10:35pm
Let x = adult tickets and y = student ones.
x = 9  y
10x + 8y = 78
Substitute 9y for x in second equation and solve for y. Insert that value into the first equation and solve for x. Check by inserting both values into the second equation. 
math  Lisa, Wednesday, February 1, 2012 at 1:35pm
6 Student tickets X $8.00 = $48.00
$78.00 minus the $48.00 = $30.00
$30.00 divided by $10.00 Adult Cost = 3 adult tickets. 
math  Dillon, Wednesday, September 11, 2013 at 6:12pm
3 adult tickets